Flowserve Worthington WXB - Manual (Page 31)

WXB USER INSTRUCTIONS ENGLISH - 07/14
Page 31 of 51
6.6 Setting impeller clearance
No axial adjustment of the rotor is necessary.
The rotor is not moving during operation.
6.7 Disassembly
See section 1.6, Safety, before dismantling
the pump.
Before dismantling the pump for
overhaul, ensure genuine Flowserve replacement
parts are available.
Refer to sectional drawings for part numbers and
identification.
6.7.1 Dismantling of pump
1) Completely drain the pump by using the drain
connection. By pumping explosive or toxic media,
flush your system with Nitrogen.
2) Remove coupling guard and uncouple the pump
from the motor. Pull off the coupling hub from the
pump shaft [2100] and take out the key [6700.2].
Ensure that the motor is
locked against start up.
If applied pull off the vane.
3) Drain the oil from both bearing housings, using the
plug [6569.1]. If required disconnect all auxiliary
pipings and auxiliary devices like vibration probes,
temperature probes, etc.
4) Due to the design with casing [1100] the complete
rotor of the pump can be taken out of the barrel
without disconnecting the suction or discharge
flange connections. To facilitate the moving out of
the complete rotor through the casing [1100], push
it by help with the hexagon head bolt [6577.3] and
joining piece for barrel [3121.2] out of the barrel fit.
Further insert a rod with a screwed end of 1“ pipe
thread into the bore of the tool [9310] on the
bearing housing. Now the complete rotor can be
easily pulled out of the barrel. For further
dismantling bring it to the workshop.
If a spare hydraulic cartridge is available, this can
be inserted into the barrel, and the pump is back in
service in a few hours.
If the whole pump should be removed, proceed
with step 5) and 6).
5) The pump has to be disconnected from suction and
discharge pipe. The alignment of the pump and
driver has to be checked and put it down in writing.
6) Unscrew the mounting screws of the pump on the
base plate. If the discharge casing were placed on
the base plate by taper pin, remove them too. Lift
the pump to a clean area by crane or other lifting
device where the pump can be disassembled.
6.7.2 Dismantling of the line bearing side
1) Loosen hexagon head bolt [6577.1] of both bearing
covers [3260.1] and [3260.3].
2) Remove bearing cover [3260.1] together with
labyrinth ring [4330.3] and O-ring [4610.1] from the
pump.
3) Unscrew hex nuts [6581.2] and remove carefully
bearing housing [3200.2] and outer ring of radial
roller bearing [3012] with the aid of a crane from
the pump.
4) Now unscrew the shaft nut [2910.2] and pull off the
locking plate [6541.2], washer [2905.2], bearing
adaptor sleeve [2471.2], O-ring [4610.8] and inner
ring of radial roller bearing [3012] from pump shaft.
5) To remove the inner ring of radial roller bearing
[3012] from bearing adaptor sleeve [2471.2] use a
pulling-off device or use two bushings whereas one
is used as support and the other as mounting
sleeve.
6) Now remove bearing cover [3260.3], if necessary.
Line bearing:
NU311 2WXB
NU313 3WXB
NU315 4WXB
NU315 6WXB
6.7.3 Dismantling of the thrust bearing side
1) Unscrew the mounting screw of fan case and
remove it. Unscrew the clamping screw of fan and
pull it off from the pump shaft.
2) Loosen the hexagon head bolt [6577.1] from
bearing cover [3260.1] and loosen the hexagon
head bolt [6577.1] from bearing cover [3260.2].
3) Remove bearing cover [3260.1] together with
labyrinth ring [4330.2] from the pump.
4) Unscrew hex nuts [6581.2] and remove carefully
bearing housing [3200.1] with the aid of a crane
from the pump.
5) Now unscrew the shaft nut [2910.1] and pull off the
locking plate [6541.1], washer [2905.1], bearing
adaptor sleeve [2471.1], O-ring [4610.2] and the
two thrust ball bearings [3013] from pump shaft.
6) To remove the two thrust ball bearings [3013] from
bearing adaptor sleeve [2471.1] use a pulling-off
device or use two bushings whereas one is used
as support and the other as mounting sleeve.
7) Now remove bearing cover [3260.2] ,if necessary.
Thrust bearing:
7311 BECB (J),(M) 2WXB
7313 BECB (J),(M) 3WXB
7315 BEGAM (J),(M) 4WXB
7315 BEGAM (J),(M) 6WXB